help..?!?

okay so I had sex with my ex for the second time on December 2nd, we didn't use a condom because he said it looses feeling for him. the first time was November 24th and I got my period the 27th.. I have my period every 2 weeks, or 14 days, but I haven't had it since the 27th and have been having symptoms for being pregnant. what do I do??? I haven't said anything to him.